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- W2054068995 abstract "Abstract One‐dimensional hydrogen‐bonded complex [Zn(bpe) 2 (H 2 O) 4 ](NO 3 ) 2 ⋅8/3 H 2 O⋅2/3 bpe ( 1 , bpe=4,4′‐bipyridylethylene) containing coordination complex cations [Zn(bpe) 2 (H 2 O) 4 ] 2+ with parallel and crisscross double bonds undergoes photochemical [2+2] cycloaddition in the solid state and produces tetrakis(4‐pyridyl)cyclobutane (tpcb) in up to 100 % yield with rctt ‐tpcb ( 2 a ) as major and rtct ‐tpcb ( 2 b ) as minor product. The bpe ligands with crisscross conformation of CC bonds appear to undergo pedal‐like motion prior to photodimerization. Grinding single crystals to powder accelerates the pedal motion of crisscrossed olefins in the bpe ligands to parallel alignment and provides the rctt‐ cyclobutane stereoisomer 2 a quantitatively. In addition, 100 % photodimerization of ground 1 indicates that the free bpe ligands, which are remote from each other in a pool of water, and NO 3 − ions moved toward each other to give a mixture of rctt ‐ and rtct ‐tpcb isomers." @default.
- W2054068995 created "2016-06-24" @default.
- W2054068995 creator A5033575784 @default.
- W2054068995 creator A5061399863 @default.
- W2054068995 date "2008-05-29" @default.
- W2054068995 modified "2023-10-18" @default.
- W2054068995 title "Solid-State Photochemical [2+2] Cycloaddition in a Hydrogen-Bonded Metal Complex Containing Several Parallel and Crisscross CC bonds" @default.
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- W2054068995 doi "https://doi.org/10.1002/chem.200701494" @default.
- W2054068995 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18438767" @default.
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