From chemistry-request@server.ccl.net Wed Aug  1 15:47:11 2001
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From: "Yuan-Yuan chen" <yuan_yuanchen@hotmail.com>
To: chemistry@ccl.net
Subject: Pericyclic additions
Date: Wed, 01 Aug 2001 15:47:06 -0400
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Hi, every one

There are two recent papers of contradictory opinions on the mechanism of 
Diels-Alder reactions if you are interested:

1. Tetrahedron Lett. 2001, 42, 5077. “Merging of 4+2 and 2+4 cycloadditon 
paths in the regiospecific dimerization of methacrolein. A case of concerted 
crypto-diradical cycloaddition”

2. http://preprint.chemweb.com/orgchem/0107002
	“Collision-induced electron reorganization as the general mechanism of 
concerted cycloaddition reactions”.

Yuan-Yuan


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