Chemical Synthesis

Various understandings and definitions of time will be reviewed. The nature and structure of time will be reviewed and the concepts of time and passage of time will be refreshed. The fundamental role played by energy and four natural forces in the actions, reactions and interactions concerning matter, anti-matter, energy in space and time will be critically analyzed. The reality how time is constructed during the construction of materials will be presented and discussed. The classical and quantum ideas in this (...) regard will be comprehensively studied. How these ideas will give us a fresh insight about the nature, structure and role of time in the construction of materials through natural scientific and manmade processes will be highlighted. The relations among matter, anti-matter, energy and time will be freshly stated. The milli-, micro-, nano, pico-, femto-, atto-times will be qualitatively analyzed considering physical, inorganic, organic and bio-materials and their construction and structure. The physics of timelessness also will be put forward. -/- . (shrink)

ABSTRACT The idea that the extension of a chemical substance is fixed by determining what stands in the relation of being the same substance to a paradigm sample plays a substantial role in chemistry, and procedures of identification that don’t make direct use of the method can be traced back to ones that do. But paradigm samples are not typically selected by ostension, as in Putnam’s version of this procedure. The relevance of ostension is questioned after a discussion of the (...) establishment of paradigm specimens in the analysis of some contents of crude oil and an examination of the general features of the same-substance relation that takes into account the temporal dependency and the consequent role of characteristic features of substances. 1Introduction 2Some Formal Properties of the Same-Substance Relation 3Characteristic Properties and Paradigm Samples 4Naming Substances Old and New 5Some Points of Comparison with Temperature 6Summary and Conclusion. (shrink)

I apply James Woodward’s interventionist theory of causation to organic chemistry, modelling three different ways that chemists are able to manipulate the reaction conditions in order to control the outcome of a reaction. These consist in manipulations to the reaction kinetics, thermodynamics, and whether the kinetics or thermodynamics predominates. It is possible to construct interventionist causal models of all of these kinds of manipulation, and therefore to account for them using Woodward’s theory. However, I show that there is an alternate, (...) more illuminating way of thinking about the third kind of reaction control, according to which chemists are thought of as manipulating which causal system is instantiated. I show that our ability to manipulate which system is instantiated is an important part of our ability to control the world, as is therefore especially relevant to interventionism. Thus, considering examples from organic chemistry leads to the identification of an important extension to Woodward’s theory. Finally, this investigation into reaction control in organic chemistry also has a more general implication: it suggests that interventionism results in a version of pragmatism about causation. (shrink)

Next SectionOne of the indisputable signs of the progress made in organic chemistry over the last two hundred years is the increased ability of chemists to manipulate, control, and design chemical reactions. The technological expertise manifest in contemporary synthetic organic chemistry is, at least in part, due to developments in the theory of organic chemistry. By appealing to a notable chemist's attempts to articulate and codify the heuristics of synthetic design, this paper investigates how understanding theoretical organic chemistry facilitates progress (...) in synthetic organic chemistry. The picture that emerges of how the applications of organic chemistry are grounded in its theory is contrasted with both standard and some more contemporary philosophical accounts of the applications of science. IntroductionTotal Synthesis as Applied ScienceUnderstanding Organic ChemistryThe Heuristics of Synthetic DesignAn Example: LongifoleneConclusion. (shrink)

This article investigates how understanding the theory of organic chemistry facilitates the total synthesis of organic compounds. After locating the philosophical significance of this question within the methodology or epistemology of applied science, I summarize the results of previous work on this issue—roughly that theoretical organic chemistry underwrites a sequence of heuristic policies that help to isolate plausible synthetic routes from the array of possibilities provided by structural or descriptive organic chemistry. While this prior account makes a solid start, it (...) does not capture all of the ways that the theory of organic chemistry contributes to total synthesis. This article aspires to enrich this account by exploring some additional ways that theory contributes. More specifically, I investigate how understanding the theory of organic chemistry can facilitate both the development of novel synthetic reactions and the implementation of a synthetic plan. The role of theory in these aspects of total synthesis will be explored by considering a particular, novel synthesis of longifolene. (shrink)

Had more philosophers of science come from chemistry, their thinking would have been different. I begin by looking at a typical chemical paper, in which making something is the leitmotif, and conjecture/refutation is pretty much irrelevant. What in fact might have been, might be, different? The realism of chemists is reinforced by their remarkable ability to transform matter; they buy into reductionism where it serves them, but make no real use of it. Incommensurability is taken without a blink, and actually (...) serves. The preeminence of synthesis in chemistry could have led philosophers of science to take more seriously questions of aesthetics within science, and to find a place in aesthetics for utility. The necessary motion twixt macroscopic and microscopic views of matter in modern chemistry leads to the coexistence of symbolic and iconic representations. And in another way to the deliberate, creative violation of categories. (shrink)

Enzymes are protein catalysts of extraordinary efficiency, capable of bringing about rate enhancements of their biochemical reactions that can approach factors of 1020. Theories of enzyme catalysis, which seek to explain the means by which enzymes effect catalytic transformation of the substrate molecules on which they work, have evolved over the past century from the “lock-and-key” model proposed by Emil Fischer in 1894 to models that explicitly rely on transition state theory to the most recent theories that strive to provide (...) accounts that stress the essential role of protein dynamics. In this paper, I attempt to construct a metaphysical framework within which these new models of enzyme catalysis can be developed. This framework is constructed from key doctrines of process thought, which gives ontologic priority to becoming over being, as well as tenets of a process philosophy of chemistry, which stresses environmentally responsive molecular transformation. Enzyme catalysis can now be seen not as enzyme acting on its substrate, but rather as enzyme and substrate entering into a relation which allows them to traverse the reaction coordinate as an ontologic unity. (shrink)

الكيمياء علمٌ تجريبي بطبيعته، يشتغل معمليًا بالجواهر تحليلاً وتركيبًا، ويُقيم بناءاته النسقية استرشادًا بقواعد محددة تحكم إجراءات البحث التجريبي ونتائجه. وكشأن أي نشاط علمي آخر، تستلزم الممارسة الكيميائية لغة جزئية خاصة تصف بناءاتها التجريبية وتُنمّط أشكالها. وما دام التحليل والتركيب – كإجراءين تجريبيين – هما عمادا البحث الكيميائي وجوهره، فمن الضروري أن تحوي لغة الكيمياء تمثيلات صورية توصف بدورها بأنها صيغٌ أو عبارات تحليلية وتركيبية. يمكننا إذن الزعم بأن ثمة علاقة اعتماد متبادلة بين لغة الكيمياء وممارساتها المعملية؛ فاللغة تؤثر مباشرة (...) – وبأكثر من طريقة – على مجرى البحث الكيميائي وتطوره, ومن خلالها يمكن تحديد مدى قوته أو ضعفه ... تقدمه أو تخلفه ... شرعية تنبؤاته أو افتقادها لسمة الشرعية المنطقية؛ كما أن سُبل البحث المعملي للكيمياء تنعكس بالضرورة على قواعد الصياغة الصورية لهذه اللغة ومدى إمكانية تطويرها وتنقيتها من شوائب اللغة العادية التي اشتُقت منها. ويعني ذلك – بعبارة أخرى – أن اللغة والتجريب شقان مُكملان لبعضهما البعض؛ وجهان لعملة واحدة تحمل اسم الممارسة العلمية. فهل تختلف اللغة الكيميائية عن غيرها من لغات العلم الخاصة؟ وكيف يستخدم الكيميائيون لغتهم؟ ما هي القواعد الحاكمة لهذه اللغة؟, وما هي نتائج استخدامها بالنسبة للكيمياء ككل؟. (shrink)

According to ‘standard histories’ of nanotechnology, the colorful pictures of atoms produced by scanning probe microscopists since the 1980s essentially inspired visions of molecular nanotechnology. In this paper, I provide an entirely different account that, nonetheless, refers to aesthetic inspiration, First, I argue that the basic idea of molecular nanotechnology, i.e., producing molecular devices, has been the goal of supramolecular chemistry that emerged earlier, without being called nanotechnology. Secondly, I argue that in supramolecular chemistry the production of molecular devices was (...) inspired by an aesthetic phenomenon of gestalt switch, by certain images that referred to both molecules and ordinary objects, and thus symbolically bridged the two worlds. This opened up a new way of perceiving and drawing molecular images and new approaches to chemical synthesis. Employing Umberto Eco’s semiotic theory of aesthetics, I analyze the gestalt switch and the inspiration to build molecular devices and to develop a new sign language for supramolecular chemistry. More generally, I argue that aesthetic phenomena can play an important role in directing scientific research and that aesthetic theories can help understand such dynamics, such that they need to be considered in philosophy of science. (shrink)

Is chemistry primarily about things or about processes, about chemical substances or about chemical reactions? Is a chemical reaction defined by the change of certain substances, or are substances defined by their characteristic chemical reactions? What appears to be a play on words to the modern scientist, is actually one of the most fundamental ontological question since antiquity, prompted by the most radical change – the chemical change or the ‘coming-to-be and passing-away’ as Aristotle’s treatise on theoretical chemistry came to (...) be known. The question has bothered philosophers ever since, who were not satisfied with the much too simplistic answer of atomism, according to which the basic elements of nature are atoms. (shrink)