Supplementary material available 1, 3-Dichlorotetra-n-Butyldistannoxane as a Novel ATRP Initiator: Property, Catalysis Ability and Mechanism Zhi Xua, Shougen Yinb, Bin Leia, Yan Lub, Weixing Changa, Jing Lia* a The State Key Laboratory of Elemento-Organic Chemistry, Nankai University, No. 94 Weijing Road, Nankai District, Tianjin, P. R. China, 300071. Tel: +86-022-23503336, Fax: +86-022-23503627, E-mail: lijing@ nankai.edu.cn b College of Science, Tianjin University of Technology, No. 263 South Hongqi Road, Nankai District, Tianjin, P. R. China, 300191. 1 Figure 1. The GPC curves of the A-A copolymer (macro-initiator) obtained from the dilute solution and the B-A-A-B copolymer (chain extension). Conditions: Solvent = o-xylene, o-xylene/BMA (1:1 v/v): [BMA] 0 = 3.15 M; Entry 6 of Table 1 was used as macro-initator, [macro-initator] = 0.001 M, Mn = 33800, PDI = 1.43; [CuCl]0 = [CuCl2] × 5 = [PMDETA]0/3 = 0.002 M; Temp = 110℃. Figure 2. The 1H NMR of the B-A-A-B copolymer (chain extension) 2 Figure 3. The GPC curves for the bulk ATRP of styrene at 110 C. Bulk: [styrene]0 =8.73 M; [CuCl] 0 = [CuCl2]0 × 5 = [PMDETA]0/3 = 0.02 M; [complex A]0 = 0.01 M. Figure 4. The GPC curves for the bulk ATRP of styrene at 110 C. Bulk: [styrene] 0 =8.73 M; [CuCl] 0 = [CuCl2] 0 × 5 = [PMDETA] 0/3 = 0.2 M; [complex A]0 = 0.1 M. 3 Figure 5. The GPC curves for the bulk ATRP of styrene at 110 C. Bulk: [styrene] 0 =8.73 M; [CuCl] 0 = [CuCl2] 0 × 5 = [PMDETA] 0/3 = 0.01 M; [complex A] 0 = 0.005 M. Attention: the crystal structures of the complex A were obtained by the diamond software version 2.1c according to the crystal data in the journal as follows: Hämäläinen, R.; Turpeinen, U. J. Organomet Chem. 1987, 333, 323-327. Figure 6. Crystal structure of the complex A (one molecular). All hydrogen atoms are removed for clarity. 4 Figure 7. Crystal structure of the complex A (one layer). All carbon and hydrogen atoms are removed for clarity. Figure 8. Crystal structure of the complex A (double layers). All carbon and hydrogen atoms are removed for clarity. 5