Stereospecific [2+2] photocycloaddition in a pseudodimeric complex between N-ammoniopropylstyrylpyridine and 18-crown-6-containing styrylpyridineстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A quaternary 4 -styrylpyridinium salt having the N-ammoniopropyl substituent forms a pseudodimeric head-to-tail complex with neutral 18-crown-6-containing 4-styrylpyridine in MeCN through H-bonding. This complex undergoes stereospecific [2+2] photocycloaddition due to preorganization of the ethylene bonds in the syn-arranged chromophoric fragments of the components. The structure of the rctt-isomer of the cyclobutane derivative obtained was established by NMR spectroscopy and X-ray diffraction analysis.