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Acknowledgements
We are grateful to the UGC, CSIR and DST (New Delhi) for financial support. We are also thankful to
the UGC for support under Special Assistance Program.
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22. Spectral data: 13C NMR (CDCl3) data: (δ ppm): (1a) 13.7, 22.1, 25.6, 27.1, 31.2, 184.8, 196.6, 199.9, 208.3; MS (EI): m/z
152 [(M+, 13%), 81 [(M+−C5H11), 20%]. (2a) 13.9, 25.9, 26.8, 28.9, 29.6, 31.8, 184.9, 196.7, 199.9, 208.3. (3a) 14.0, 22.6,
26.0, 27.5, 29.3, 29.7, 31.7, 31.9, 184.8, 196.6, 199.7, 208.4. (4a) 128.7, 129.7, 131.2, 134.6, 187.4, 196.1. (3c) 10.1, 18.6,
21.5, 27.7, 30.6, 36.2, 38.5, 124.0, 132.4, 172.5, 175.9. (5a) −2.1, 13.7, 22.2, 26.5, 29.0, 31.8, 200.1, 201.4, 207.7, 211.3.
MS (EI): m/z: 224 (M), 154 (B); HRMS; m/z calcd: 224.123258, found: 224.123138. (6a) −2.1, 14.0, 22.5, 26.8, 29.0, 29.6,
31.5, 31.7, 200.0, 207.6, 211.2. (7a) 13.7, 22.1, 26.9, 28.4, 29.3, 31.8, 74.9, 124.9, 125.3, 128.3, 128.8, 196.4, 198.5, 201.2,
202.9. MS (EI); m/z: 272 (M+, 4%). HRMS; m/z calcd: 272.141243 found: 272.141843. (7c) 13.4, 13.7, 19.9, 22.1, 24.6,
25.1, 29.5, 31.2, 31.3, 38.3, 42.7, 57.0, 74.8, 125.6, 127.7, 128.2, 143.6, 178.5, 179.1. MS (EI); m/z: 347. Anal. calcd for
C21H31O3N: C, 73.04; H, 8.98; N, 4.05. Found: C, 73.10; H, 9.15; N, 4.11. (8a) 13.8, 13.9, 22.2, 22.4, 24.9, 26.0, 26.9, 28.9,
31.5, 31.8, 35.0, 68.6, 197.3, 198.4, 201.8, 202.7. MS (EI); m/z: 266 (M++1, 5%), 195 (M+−C5H11, 16%).
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