Table 5.

Effect of molecular sieves amount and the pyrrolidine concentration on the reaction rate

Entrya	MS (g/mm ol)	Cat. (mol%)	Solvent	%Conversioni
1	0	10 catb	MeOH	80	100
2	0.1	10 catb	MeOH	74	100
3	0.2	10 catb	MeOH	78	100
4	0.3	10 catb	MeOH	85	100
5	0.4	10 catb	MeOH	84	100
6	0.5	10 catb	MeOH	84	100
7	0.7	10 catb	MeOH	84	100
8	0	5 catb	MeOH	54	84	100
9	0	1 catb	MeOH	11	28	58
10	0	0.1 catb	MeOH	0	0	0
11	0	0.01 catb	MeOH	0	0	0
12	0	40 catc	MeOH	0.5e
13	0	80 catc	MeOH	5f
14	0	10 catb	CH3CN	23	55	89g
15	0	10 catb	DMSO	19	48	88g
16	0	10 catb	Ether	0	0	0
17	0	10 catb	THF	0	0	0
18	0	10 catb,d	Ether	0	1	4h
19	0	10 catb,d	THF	0	1	4h

^aAll entries are for the reactions of 2b with cyclopentadiene in 1:1.2 ratios at room temperature.

^bCatalyst pyrrolidine.

^cCatalyst DEA.

^d200mol% MeOH.

^eThe yield after 24 h is 39.

^f66% after 24 h.

^g100% after 24 h.

^h20% after 24 h.

ⁱConversion at 0.5h, 1.7h and 5h, respectively.