Synthesis of Block Copolymers of Varying Architecture Through Suppression of Transesterification during Coordinated Anionic Ring Opening Polymerization

Table 4

Presence of hypothetical products of reaction between tin octoate and α-methylstyrene detected at different catalyst : α-methylstyrene ratios.

N	Hypothetical products of reaction	Molecular mass, a.m.u.	Molar ratio catalyst : methylstyrene
			1 : 2,5	1 : 125	1 : 300
1	R–CO–O–Sn–O–CO–R	405.12		+	+
2	Ms–CO–O–Sn–O–CO–R	422.94	+
3	Ms–O–Sn–O–CO–R	394.94	+	+
4	Ms–Sn–O–CO–R	378.95	+	+	+
5	Ms–CO–O–Sn–O–CO–Ms	441.34	+
6	Ms–CO–O–Sn–O–Ms	413.33	+	+	+
7	Ms–CO–O–Sn–Ms	397.34	+	+	+
8	Ms–O–Sn–O–Ms	385.05	+	+	+
9	Ms–O–Sn–Ms	369.06		+
10	3Ms–Sn	470.25	+	+
11	4Ms–Sn	587.43		+
12	R–Ms–R	314.32			+
13	R–CO–O–Ms	260.24		+	+
14	R–CO–Ms	244.25			+

–O–CO–R is an anion of octanoic acid and R = CH(CH₂CH₃)–(CH₂)₃–CH₃ (99.07 a.m.u.); + denotes the presence of the stated mass in MALDI-TOF spectrum; Ms : α-methylstyrene.