https://www.umsl.edu/~chickosj/JSCPUBS/dsccal.pdf

Reference materials for calorimetry and differential thermal analysis

Role of sulphur-heterocycles in medicinal chemistry: An update

High resolution nuclear magnetic double and multiple resonance

Publisher Summary This chapter discusses aromaticity of heterocycles. At a time when the validity of the concept of aromaticity is questioned, increasingly, it seems appropriate to review various definitions in common use and to survey their applications in heterocyclic chemistry. From a qualitative viewpoint the characteristics of an aromatic compound are easy to define. A compound is said to be aromatic if it is cyclic and unsaturated with an enhanced stability over simple olefinic compounds. The characteristic aromatic reactivity of the type described is clearly a matter of degree and is difficult to assess quantitatively. From a simple consideration of pyridine, which reacts less readily with electrophiles but more readily with nucleophiles at the ring carbon atoms than does benzene, it soon becomes apparent that attempts to discuss even relative aromatic character using kinetic criteria is fraught with difficulties; this is apart from the fundamental objection that chemical reactivity is not solely a function of ground-state stability.

Aromaticity of Heterocycles

Publisher Summary This chapter discusses the molecular structure and physical properties of thiophenes. The whole arsenal of spectroscopic and other physical methods are utilized to study the aromatic character of thiophene and the substituent effects in thiophenes. Metalation and halogen-metal interconversion reactions are shown to be of great utility in the preparation of substituted thiophenes. The chapter also discusses the spectroscopy of thiophenes and thermodynamic properties of thiophene 2-methylthiophene, and 3-methylthiophene. Different methods discussed for the preparation of thiophenes are ring-closure reactions, heterocyclic systems, 2-substituted compounds, and 3-substituted compounds. Comparison of the 2- and 3-positions of thiophene with benzene is provided. In the reactions of 2, 5-disubstituted thiophenes elimination of α-substituent occurs to a much greater extent than in the benzene series. Side-chain reactivity of thiophenes is also provided in the chapter. The reactions leading to the destruction of the thiophene aromaticity is discussed.

Recent advances in the chemistry of thiophenes.

/pdf/a-moving-bomb-method-for-combustion-calorimetry-of-organic-2vm6u80pto.pdf

A Moving-Bomb Method for Combustion Calorimetry of Organic Bromine Compounds.

/pdf/proton-magnetic-resonance-of-thiophenes-iii-splitting-of-33eo31o1ri.pdf

Proton Magnetic Resonance of Thiophenes. III. Splitting of Side-chain Resonance Peaks.

The signs of the side-chain spin couplings in furanaldehydes as determined by nuclear magnetic triple resonance

3-Substituted Furans.

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