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technique. 29 The contact of methanol with Viton O-rings which were used to separate the reaction mixture from the pressurizing fluid caused an increase in absorption at the near-ultraviolet region. Therefore, the rates for 2 and 3 were obtained by the batch method. The reaction mixture was kept in a glass hypodermic syringe with a Teflon cap for 3 to 15 h at the desired conditions and analyzed spectrophotometrically.

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