Download e-book for iPad: Advances in Heterocyclic Chemistry, Vol. 34 by Alan R. Katritzky (ed.)

By Alan R. Katritzky (ed.)

ISBN-10: 012020634X

ISBN-13: 9780120206346

Meant for natural chemists, this quantity follows the structure of past volumes and offers updated info on chosen components of heterocyclic chemistry.

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Extra resources for Advances in Heterocyclic Chemistry, Vol. 34

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A . Thermal Reactions Formally Involving No Other Species 53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 . 55 . 55 . 56 . 56 . 57 . 58 . 58 . 59 . 59 . 60 . 61 . 62 . 62 . 64 . 64 . 65 . 65 . 65 . 65 . 65 . 65 . 66 . 67 . . . . 67 . . . . 68 68 68 68 . . . . . . . .

The most important of these is indene formation. '''*1'2The intramolecular nature of the hydride shift was established by lack of exchange with deuterium in the solvent. Me0,C C0,Me P Phh Z N C0,Me A (122) ph+2Me Ph __* Q+ C0,Me C0,Me ! (164) I carbene insertion [ l,S]-shift Ph 20% H 69% SCHEME 58 The ratio of cyclopropene to indene varies with different pyrazole ring suband thus may depend on the carbene singlet t o triplet r a t i ~ . '05 st~tuents4s'47'71'150,15z,153 Sec. 6' Photolyses carried out in acetic acid give allylic acetates, apparently via a diazoacetate (Scheme 60) "*".

Chem. , 289 (1970). R . Paredes and W. R . , Rev. Latinoam. Quim. 6, 29 (1975) [CA 83, 8773p ( 1975)). 26 [Sec. H MICHAEL P. SAMMES AND ALAN R. KATRITZKY 2. Il8 Hypobromite oxidation of 97 leads to the same compound’29(Scheme 3 9 , whereas the 4-bromo analog of 96 has been prepared by base elimination of HBr from a dibromopyrazoline N,N’-dioxide p r e c u r ~ o r . ” ~ /Me M e n M e C,H,,ONO, ACOH Me NOH “+OH Me Me N

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Advances in Heterocyclic Chemistry, Vol. 34 by Alan R. Katritzky (ed.)


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