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85033746788
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note
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2 did not speed up the reaction any further, 9 (a) Preparation of the catalyst (LPSG): Commercially available lithium perchlorate (2g) (Fluka) was dissolved in 10 mL diethyl ether to which was added chromatographic grade silica gel (100-200 mesh) (4g) and the mixture stirred for 30 min. Ether was removed and the material dried in vacuo (0.1 ton) at 150°C for 25h to give the catalyst (LPSG) as a white free flowing powder.
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25
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85033740482
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note
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1b (298 mg; 100%).
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28
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85033733922
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note
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3) 168.592(s), 168.504(s), 142.586(s), 136.426(d), 134.260(s), 134.088(s), 129.440(d), 129.327(d), 127.272(d), 127.036(d), 116.027(1), 83.453(d), 61.103(t), 60.893(t), 59.155(d), 56.210(d), 42.129(t), 40.592(s), 35.921(d), 28.351(q), 27.161(q), 24 763(q), 19.625(s), 17.418(q), 14.088(q), 13.823(q).
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