Photocyclodimerization of 5‐Methyl‐2H‐pyran‐3(6H)‐one |
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| Authors: | Ljubov Groesch Jürgen Kopf Paul Margaretha |
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| Institution: | 1. Chemistry Department, University of Hamburg, Martin‐Luther‐King Platz 6, D‐20146 Hamburg, (phone: +49?40?42?83?84?316;2. fax: +49?40?42?83?85?592) |
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| Abstract: | The structures of the main products resulting from photocyclodimerization of the title compound 2 and of other 3‐methyl‐substituted ‘oxacyclohex‐2‐en‐1‐ones’ (=dihydropyranones) were determined by X‐ray crystallography. In connection, the 13C‐NMR chemical shifts of the cyclobutane C‐atoms of these dimers allow a clear differentiation between head‐to‐head and head‐to‐tail regioisomers, all structurally related to those of isophorone ( 1 ). |
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| Keywords: | Photocyclodimerization X‐Ray crystallography 2H‐Pyran‐3(6H)‐one 5‐methyl‐ Cyclohex‐2‐enones |
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