Ph 3c Research Articles

Benzocyclobutenylidene- h5-cyclopentadienyldicarbonyl-iron(II). A hydride abstractor more specific than the triphenylcarbenium ion

Benzocyclobutenylidene- h 5-cyclopentadienyldicarbonyliron(II) hexafluorophosphate converts h 5-CpFe(CO) 2R (R = cyclo-C 3H 5, CH 2-cyclo-C 3H 5) to the respective allene and butadiene complexes whereas Ph 3C + primarily yields addition products; both carbenium ions add to h 1- allyl- and substituted h 1 -allyl-iron complexes with the exception of the 3,3-dimethylpropenyl complex which is converted in both cases to h 5-CpFe(CO) 2(CH 2CHCMeCH 2) +.

The mechanism of decay of active centres in polymerization of trioxan in solution

As a result of kinetic and spectrophotometric studies of the polymerization of trioxan with B +A − salts as catalysts (where B + = Ph 3C +, CH 3CO + or CH 3OCH 2 +, and A − = SbCl 6 − or SbF 6 −) it has been found that termination of the growing chains involves both physical and chemical processes the ratio of the two being dependent on the structure of the active centres and on the conditions of polymerization.

Primary photochemical processes of tetraphenylmethane solids

Studies of UV irradiatated tetraphenylmethane crystals by electron paramagnetic resonance and electronic optical spectroscopy are presented. The primary processes of photochemical reactions are proposed as: (1) (C 6H 5) 4C + hv → (C 6H 5) 3C· + C 6H 5· and (2) 2C 6H 5· → C 6H 5C 6H 5. No similar effect occurs with other tetrapheny compounds, triphenylmethane, or diphenylmethane. The steric strain in Ph 4C and effective resonance in Ph 3C· may be responsible for the high q of the above photochemical reactions.

Reactions of bis(triethylgermyl)cadmium with alkyl halides involving a one-electron transfer process

The reactions of bis(triethylgermyl)cadmium with trityl chloride (chlorotriphenylmethane), benzyl bromide and allyl iodide in a 1 1 ratio in aprotic solvents proceed through the selective cleavage of the GeCdGe linkage. As well as (triethylgermyl) cadmium halide, such reactions also yield the recombination products of Et 3Ge and R radicals (R = Ph 3C, PhCH 2, CH 2CHCH 2, respectively). In addition, the reaction with trityl chloride gives free trityl radicals which may be detected by ESR spectroscopy.