Table 3.

Exploration of isomerization of 85

	conditions	results
1	Pd/C, H2 (activation), EtOAc, r.t.	no reaction, 85 recovered, no dimer
2	(PhCN)2PdCl2, benezene, 60 °C,	dimer and trace 87, acetal deprotection
3	(Ph3P)3RhCl, Et3SiH, 100 °C	dimer, hydrosilation, trace 87
4	Co(salen)Cl, PhSiH3, r.t. to 60 °C	dimer
5	Co(dmgH)2 •2 H2O, PhSiH3, 60 °C	dimer, reduction, and trace 87
6	RhCl3 •xH2O (0.2 equiv.), EtOH, 100 °C	20% yield of 87. dimer, acetal hydrolysis
7	using Mannich base as substrate K2CO3 (2 equiv.)	33% yield of 87. EtOH addition no acetal hydrolysis