Pyrroles 1-methyl-2,3,4,5-tetraphenyl

Thieno[3,4-c]pyrrole dipole moment, 4, 1049 (74JA1817) Thieno[3,4-c]pyrrole, 5-methyl-1,3,4,6-tetraphenyl-MS, 4, 1045 (75ACR139)... 

Similarly, heating of methyl 3-acyl-l-(diphenylmethyleneamino)-4,5-dioxo-4,5-dihydro-l//-pyrrole-2-carboxylates 96 gave the corresponding dimethyl 2,8-diacyl-3,9-dioxo-5,5,ll,ll-tetraphenyl-3,5,9,lTtetrahydrodipyrazolo[l,2- 7 l, 2 -i [l,2,4,5]tetrazine-l,7-dicarboxylates 99 in good yields. The proposed mechanism involves thermal decarbon-ylation to give the ketene intermediate 97, which cyclizes into the azomethine imine 98, followed by dimerization (Scheme 24) <2004T5319>. 

The yc(inner carbon)Pt Coupling of 983 zb 7 Hz and yc(outer carbon)Pt 32.5 0.7 Hz, observed by Wang et in the spectra of three novel Pt(ii) 2-N substituted N-confused porphyrines, (2-aza-2-benzylo3Q carbonyl-methyl-5,10,15,20-tetraphenyl-21-carbaporphyrinato-N//, N")platinum(ii), (2-aza-2-p-cyanobenzyl-5,10,15,20-tetraphenyl-21-carbaporphyrinato-iV,iV, N")platinum(ii) and (2-aza-2-ptrifluoromethylbenzyl-5,10,15,20-tetraphenyl-21-carbaporphyrinato-N,iV, iV")platinum(ii) have been used by the authors as the proof that the Pt atom in the studied compounds is coordinated to three nitrogen atoms and to the unsubstituted p-carbon atom of the pyrrole ring. 

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