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- W1043351719 endingPage "186" @default.
- W1043351719 startingPage "75" @default.
- W1043351719 abstract "This chapter discusses the conformations of acyl groups in heterocyclic compounds. The chapter illustrates that the considerable number of results reported for acyl heterocycles enable a number of conclusions to be tentatively drawn, indicating the presence both of common behaviors and of differentiating trends in the classes of compounds examined. In the 2-acyl derivatives of the five-membered heterocycles, the X,O-cis predominates and is almost unperturbed by medium effects, except that of furan, which is characterized by a mobile solvent-dependent equilibrium. This chapter explains the coplanarity of the formyl group with the heterocyclic ring which is found, as a general rule, in these compounds, whereas significant twist may occur in the case of the acetyl substituent; this twist may become greater for the benzoyl or, more generally, aroyl groups. In acyl derivatives of saturated heterocycles conformational preference is governed by steric, short-range coulombic electrostatic and dipole-dipole effects. The ring and acyl group conformations can be reciprocally conditioning. Moreover in C- and N-acyl derivatives of three-membered rings, the geometry of the conformers still seems rather undetermined and, as a result, the same may be said of conformer populations. This chapter concludes that a great deal of experimental and theoretical work has been done on acyl heterocycles, but still there is a scope of deep attention and investigation." @default.
- W1043351719 created "2016-06-24" @default.
- W1043351719 creator A5020446894 @default.
- W1043351719 creator A5056152624 @default.
- W1043351719 creator A5056824383 @default.
- W1043351719 creator A5066999577 @default.
- W1043351719 date "1987-01-01" @default.
- W1043351719 modified "2023-09-27" @default.
- W1043351719 title "The Conformations of Acyl Groups in Heterocyclic Compounds" @default.
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