- Synthesis of some C2-symmetric bidentate ligands and their complexes derived from Feist's acid
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Various new C2-symmetric bidentate ligands, bearing phosphorus, nitrogen, and sulfur, were obtained in an efficient manner, starting from (±)-trans-3-methylidenecyclopropane-1,2-dicarboxylic acid (Feist's acid; (±)-trans-3). The structures of the new bidentate ligands, di(tert-butyl) (±)-[(trans-3-methylidenecyclopropane-1,2-diyl)dimethanediyl] biscarbamate ((±)-9), (±)-(trans-3-methyldienecyclopropane-1,2- diyl)dimethanaminium dichloride ((±)-10), (±)-S,S′-[(trans- 3-methylidenecyclopropane-1,2-diyl)dimethanediyl] diethanethioate ((±)-11), and (±)-[(trans-3-methylidenecyclopropane-1,2-diyl) dimethanediyl]bis(diphenylphosphane) ((±)-12), were fully characterized by standard spectroscopic techniques. These new classes of C2- symmetric bidentate ligands have the potential to be used in asymmetric catalysis. Copyright
- Al-Majid, Abdullah M. A.,Al-Othman, Zeid A.,Islam, Mohammad Shahidul
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- Extractives from New Zealand Honeys. 5. Aliphatic Dicarboxylic Acids in New Zealand Rewarewa (Knightea excelsa) Honey
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Thirty-two aliphatic dicarboxylic acids were identified as methyl esters in the methylated diethyl ether extracts of four unifloral grade New Zealand rewarewa (Knightea excelsa) honeys using combined gas chromatography-mass spectrometry (GC-MS). 2-Methoxybutanedioic acid (O-methylmalic acid) and 4-hydroxy-3-methyl-trans-2-pentenedioic acid are proposed as floral marker substances for New Zealand rewarewa honey.The total level of aliphatic dicarboxylic acids identified in the rewarewa honey samples ranged from 64 to 111 mg/kg, with an average level of 88 mg/kg.Keywords: Rewarewa (Knightea excelsa) honey; aliphatic dicarboxylic acids; 2-methoxybutanedioic acid; 4-hydroxy-3-methyl-trans-2-pentenedioic acid
- Wilkins, Alistair L.,Lu, Yinrong,Tan, Seng-To
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