Tetramethylsilane

Three types of isotactic PP granules (homopolymer (PP-H), random copolymer (PP-R), and block copolymer (PP-B)) were obtained from Sumitomo Chemical Co., Ltd. (Tokyo, Japan), as listed in Table 1. These granules contained no additives, such as antioxidants or UV stabilizers. The spin trapping reagent TTBNB was purchased from Fujifilm Wako Pure Chemical Co. (Osaka, Japan), and 1,1,1,3,3,3-hexafluoro-2-isopropanol (HFIP) was purchased from Flourochem Ltd. (Glossop, UK); these chemicals were used as received. Deuterated chloroform (CDCl₃) with tetramethylsilane (TMS) as an internal reference was purchased from Tokyo Chemical Industry Co., Ltd. (Tokyo, Japan).

APTMS, MAPTMS, DMAPTMS, TMTESPAC, tris(2,4-pentanedionato)chromium(III) [Cr(acac)₃], and tetramethylsilane (TMS) were purchased from Tokyo Chemical Industry Co., Ltd. (Tokyo, Japan). HNTf₂ was purchased from Kanto Chemical Co., Inc. (Tokyo, Japan). 2,5-Dihydroxybenzoic acid (DHB) was purchased from Bruker Daltonik Gmbh (Bremen, Germany). Other reagents and solvents were purchased from FUJIFILM Wako Pure Chemical Co., Ltd. (Osaka, Japan). All reagents and solvents were used without further purification.

Microcrystalline Avicel^® PH-101 cellulose was purchased from Sigma-Aldrich (St. Louis, MO, USA) and was dried at 80 °C under vacuum for 12 h before use. N-Butyl-N-methylpyrrolidinium chloride (>99%) was also purchased from Sigma-Aldrich (St. Louis, MO, USA). Silver oxide (99%) and activated charcoal powder were purchased from FUJIFILM Wako Pure Chemical Corp. (Chuo-ku, Osaka, Japan). Epichlorohydrin (ECH) (>99%) and tetramethylsilane (99%) were purchased from Tokyo Chemical Industry Co., Ltd. (Chuo-ku, Tokyo, Japan). Dimethyl sulfoxide-d₆ (DMSO-d₆) (99.9% D) was purchased from Kanto Chemical Co., Inc. (Chuo-ku, Tokyo, Japan). Unless otherwise specified, reagents and chemicals were used as received without further purification.