The syntheses of the pyrazolylmethylpyridines (5a-c), their chiral derivatives (7) and (8), and the chiral methylenebisindazoles (9)-(11) are reported. These bidentate ligands form stable 1 : 1 complexes with PdCl2. A single-crystal X-ray structure determination of dichloro [(4S,7R)-7,8,8-trimethyl-2-(pyridin-2-ylmethyl)-4,5,6,7-tetrahydro-4,7-methano-2H-indazole]palladium(II),(16), is also reported.
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House et al. (1986) studied this question.