Y-Collidine

At a concentration of y-collidine of 0.50 M the photocross 1 inking is completely inhibited, which could be due to competitive charge-transfer complexation of ground state of excited state TCPA rather than interfering with cationic propagation. (Forster s book on charge-transfer complexes shows that y-collidine can form complexes.)... 

S-ethyl as LGC.114 First, the bromide donor 77 was activated over the phenylselenide acceptor 78 in the presence of AgOTf/y-collidine to give the desired disaccharide 79 in 60% yield. The latter was then directly activated over the SEt acceptor 80 by the addition of Ag0Tf/K2C03 to produce the desired trisaccharide 81 in 81% yield. Apparently, the trisaccharide 81 can be directly activated for subsequent glycosyl-ations. A similar activation sequence was reported by Ley s group.116... 

This view is supported by the observation that small quantities of pyridines which have lost the 2-methyl group are present in the reaction mixture.22 It may also be noted that y-collidine gave traces of a mixture of several 2,2 -bipyridines, which reacted with ferrous ions... 

The (fflni-isomer was isolated after stirring the mixture at rt for 10 h, with /-BuOK in hexane, the cA-isomer after heating the mixture with y-collidine at 140°C for 3 h. ... 

Beilstein Handbook Reference) AI3-10050 BRN 0107283 a,y,a -Coltidine y-Collidine 2,4,6-Collidine s-Collidine EINECS 203-613-3 HSDB 57 2,4,6-Kollidin NSC 460 Pyridine,... 

Trimethyl Pyridine (y Collidine) ((CH3)jC5H2N) —(mol weight 121.18), (Warning—See Note 8) conforming to the following requirements ... 

Note 8 Wanting—2,4,6-Trimcthyl Pyridine (y collidine) is hazardous if swallowed, breathed, or spilled on skin or eyes. Precaution-Wear chemical safety goggles, neoprene or rubber gloves and apron. Use only in a well-ventilated hood, or wear an approved respirator for organic vapor or a supplied-air respirator. Do not take internally. 

Pentafluorophenol (1) reacts with Phosphorus(V) Chloride in the presence of a base, triethylamine or y-collidine, to yield perflu-oropentaphenoxyphosphorane (8) plus perfluorotriphenyl phosphate (9) and perfluorodiphenyl ether (10) (eq 6), ... 

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