Table 1. Optimization of the Acylation of Ferrocene with Unprotected Glycine.

entry	TFAA eq	acyl trifluoroacetate generation time min	reaction time h	3a	4	% of reacting Fc-H
1	2	15	1	17%	46%	97%
2	2	30	1	21%	45%	94%
3	2	30	4	25%	45%	96%
4	3	30	1	26%	44%	94%