Cyclopentadienylmethyl

Methylmagnesium chloride Magnesium, chloromethyl- (8, 9) (676-58-4) Chloromethyltitanocene Titanium, chlorodi-Ti-cyclopentadienylmethyl- (8) Titanium, Chlorobis(Ti -2,4-cyclopentadien-1-yl)methyl- (9) (1278-83-7)... 

Cyclopentadienylmethyl-3-methyl thietane has been obtained by substitution of a mesyloxy group using cyclo-pentadienylmagnesium chloride as nucleophile (Equation 16) <1998JOM433>. 

In bicyclohexenyl radicals additionally substituted at C-6, an endo - exoisomerization was found to proceed with a rate comparable to the walk rearrangement (120). If one starts with endo-78-3-d (R = CH2OH), the reaction product consist of a mixture of exo-78-2- and -3-d. Both reactions, walk rearrangement and endo - exo isomerization, have been assumed to involve an intermediate cyclopentadienylmethyl radical of type 79. In view of MO considera-... 

Palladium and platinum nanoparticies may be prepared in a block co-polymer. The complexes VA endo-Z-(cyclopentadienylmethyl)norborn-5-ene](l-phenylallyl) and PtMe3[OT o-2-(cyclopentadienylmethyl)norborn-5-ene] are dispersed in the matrix by ring-opening metathesis polymerization using W or Mo alkylidene catalysts. 

Fig. 5. Crystal structure of l,3-bis(cyclopentadienylmethyl)benzenezirconium dichloride. Reproduced from Ref 50 by permission of The Royal Society of Chemistry.

The conversion of the bicyclo[2,2,l]heptene aldehydes (475) into PGp2a via the aldehyde (476) has previously required a number of protection and deprotection steps. An improved procedure for the conversion (475) - PGp2 in seven steps that avoids the need to prepare (476) or for protection has now been described. A new procedure for oxidative decarboxylation has been introduced that is of relevance in prostaglandin synthesis.Diels-Alder reaction between 5-cyclopentadienylmethyl methyl ether... 

For the photoadditions of TFE to benzene and substituted benzenes, cyclopentadienyl carbenes are also possible as intermediates. Protonation will result in the formation of cyclopentadienylmethyl cations. These primary cations would be expected to collapse to the more stable allylic ones (i.e., 17 in Scheme 4), which will be relatively long lived, as the thermal opening to the benzenium ion, although exothermic, is thermally forbidden. In fact, the activation energy for this process has been estimated at 19 kcal/mol at —20°C. ... 

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