Table 1.

1-Hexyne Trimerization Data^a

[Ti]	% trimer yield	A/B	% [Ti] act.b	C/D	% conversion	TONc
1	quant.	27:73	37 ± 4	86:14	100 ± 0	18 ± 2
2	87 ± 1	35:65	6 ± 2	78:23	89 ± 3	94 ± 31
3d	94 ± 4	39:61	5 ± 1	100:0	98 ± 2	132 ± 38
4	61 ± 5	24:76	32 ± 3	75:25	93 ± 4	12 ± 2
5	85 ± 2	39:61	20 ± 10	60:40	100 ± 0	28 ± 14
6	quant.	31:69	30 ± 4	86:14	100 ± 0	21 ± 4
7	41 ± 8	37:63	31 ± 8	65:35	64 ± 16	9 ± 4
8	62 ± 4	33:67	36 ± 9	100:0e	100 ± 0	11 ± 4
9	53 ± 2	34:66	11 ± 1	100:0e	91 ± 3	32 ± 4
10	71 ± 2	27:73	61 ± 3	100:0e	100 ± 0	7 ± 0
11	50 ± 4	37:62	33 ± 4	100:0e	75 ± 4	10 ± 1
12	34 ± 9	15:85	57 ± 19	37:63	64 ± 7	4 ± 2
13	40 ± 5	17:83	15 ± 2	69:31	55 ± 14	17 ± 3
14	18 ± 3	39:61	7 ± 1	31:69	56 ± 13	17 ± 4
15	65 ± 5	21:79	38 ± 1	65:35	76 ± 12	11 ± 1
16	24 ± 2	42:58	0 ± 0		53 ± 5

^aConditions: 5 mol % [Ti], 0.4 M 1-hexyne, C₆D₅Br, 16 h, 115 °C, average of 2ȓ4 runs. Quantitation determined by in situ ¹H NMR.

^b% Ti activated = (yield of C + D)/[Ti]_tot.

^cTON = (yield of A + B)/Ti activated.

^d<5 min, room temperature |

^eD (R = N^tBu) could not be independently synthesized/characterized, although raw spectra indicate only formation of C.