J. Wolters

An Intriguing plumbylene: Bis[2-(dimethylaminomethyl)-phenyl]lead

The diaryllead compound bis[2-(dimethylaminomethyl)phenyl]lead has been isolated and characterized. The monomeric composition of the plumbylene has been established by cryoscopic measurements. Comparison of the 1H and 13C NMR data of this plumbylene with those of tetrakis[2-(dimethylaminomethyl)phenyl]lead reveals striking differences

Aromatic leady(IV) compounds XIII. 13C FT-NMR investigations on alkylphenyllead(IV) compounds☆

Abstract The 13C FT-NMR data of several organolead compounds of the type Phn-PbR4-n (R = alkyl, cycloaklyl; n = 0−4) are reported. Substituent chemical shift parameters have been calculated for the triphenyllead group in alkyltriphenyllead compounds. Variations of the 207Pb−13C coupling constants are discussed in terms of changes of hybridisation and nuclear charge of the lead atom. Steric factors can also play an important role, especially in the compounds Ph3Pb(cyclo-CnH2n−1 n = 6, 7.

Aromatic lead(IV) compounds : X. H and C NMR spectroscopy of compounds ArnPb(OAc)4−n (n 14)

Abstract 1 H and 13 C NMR data are reported for the compounds Ar n Pb(OAc) 4− n ( n  14). The increase of the 207 Pb 1 H and 207 Pb 13 C coupling constants with the number of acetate groups is explained in terms of changes in hybridization and effective nuclear charge. The occurrence of solvent effects is discussed for C 6 H 5 Pb(OAc) 3 . The effects of the solvent depend primarily on the dielectric constant and the coordinating properties. In methanol, methanolysis may occur.

Some spectroscopic properties of cyclic organolead compounds I

Abstract The nuclear magnetic resonance and infrared properties of two new cyclic organolead compounds are discussed.

Organobismuth compounds : I. Metallochirality in diarylhalobismuthines

Abstract The preparation of some bismuthines containing a chiral centre at the bismuth atom is reported and their structures are established by NMR spectroscopy.

Synthesis of metallochiral triorganobismuthines

Abstract Triorganobismuthines containing a chiral centre at the metal atom have been prepared by selective bromodearylation of mixed triarylbismuthines, followed by reaction of the resulting chiral diarylbromobismuthines with arylmagnesium bromides. The NMR spetra of some of the new compounds exhibit diastereotopic effects, associated with the chirality, indicating that the bismuthines have a stable pyramidal configuration.

Cyclic organolead compounds : III. Synthesis and dynamic behaviour of 10,10-dimethylphenoxaplumbin and a twelve membered heterocyclic organolead compound C28H28O2Pb2☆

Abstract The synthesis of 10,10-dimethylphenoxaplumbin (II), a related twelve membered ring compound (III), and 2,2′-bis-(trimethyllead)diphenylether (IV) are reported. These compounds have been studied by NMR ( 1 H, 13 C and 207 Pb) and IR spectroscopy. The twelve membered cyclic organolead compound (III) exists in solution as an equilibrium mixture of different conformational isomers.