“…IR: 1660 (CO), 1610, 1620 (C=C). 'H-NMR: 0,72-1,05 (Signalhaufen, 9H); 1,6(s,3H);1,95(d,J=6,3H);2,3(d,J=9, lH):5, 5(br.s,1H);6,08-7,32(m,4H).MS:232(9,Mt),217 (4), 162 (45), 147 (loo), 119 (13), 105 (22), 93 (29), 77 (19), 69 (55), 55 (19), 41 (37).…”