Étude du Comportement D'Isomères Géométriques Sous L'impact Électronique III. Corrélations Entre Les Spectres de Masse et la Structure Moléculaire Dans Une Série de 1,2-DIALCOYLCYCLOHEXANES.

✍ Scribed by P. Natalis

• Publisher: Wiley (John Wiley & Sons)
• Year: 2010
• Weight: 313 KB
• Volume: 72
• Category: Article
• ISSN: 0037-9646
• DOI: 10.1002/bscb.19630720512

✦ Synopsis

Correlations between mass spectra and molecular structure are attempted in a series of cis and trans 1,2-diaIkylcyclohexanes previously investigated. Rather large differences appear between abundances of main fragment ions, especially (P-R1)+ (parent ion having lost the Rl group) and (P-Rl-H)+, some of which can be related to the different stability of the two kinds of stereoisomers. Metastable transitions indicate that an important fragmentation process is given by a sequence of the type P' + (P-R1)+ + (P-RI-R~)~.

Nous avons propose precedemment (l) l'attribution de la configuration cis-trans aux isomkres geometriques d'une serie de 1,2-dialcoylcyclohexanes, connus antkrieurement sous l'appellation ((high boiling)) et clow boiling)). La formule de ces cornposks est R ? / \ / CHz-CH CH-RI / . CHz CH2-CH2 ou R2 represente un des groupes CH3, C2H5, n-C3H7, i-C3H7, n-CdH9 ou i-C4H9, et R1 le groupe CHz-CHz CHZ-CHZ \ / CH-CHZ-.