- N,N'-Ditrytylurea, a Versatile Host for Crystalline Host-Guest Complexes
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N,N'-Ditrytylurea forms stoicheiometric crystalline complexes with guests containing varied functionality; its large rigid end-groups prevent host-host close packing and leave substantial voids for guests, many of which hydrogen bond to the urea moiety.
- Hart, Harold,Lin, Lon-Tang W.,Ward, Donald L.
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- Direct extraction of carbonyl from waste polycarbonate with amines under environmentally friendly conditions: Scope of waste polycarbonate as a carbonylating agent in organic synthesis
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An efficient green method for converting waste polycarbonate into urea derivatives by reacting with primary amines has been developed. Simple treatment of polycarbonate plastic with primary amines in a closed vial at 80 °C without using any catalyst and toxic solvents made this process environmentally friendly. Digestion of the waste polycarbonate obtained from CDs and DVDs with amines affords functionalized urea and 4,4′-(propane-2,2-diyl)diphenol (BPA, bisphenol-A). The procedure is optimized to get maximum conversion of polymer to urea and its derivatives as a major product. The purification procedure to isolate the urea derivatives in the presence of bisphenol-A has been tuned to avoid chromatographic procedures. This environmentally friendly method provides (i) an alternative for recycling BPA from polycarbonate, (ii) a method of obtaining useful product like urea derivatives, (iii) scope for new carbonylating agents in organic synthesis, (iv) an amine functionalized polycarbonate surface. This journal is
- Singh, Sukhdeep,Lei, Yong,Schober, Andreas
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p. 3454 - 3460
(2015/02/19)
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- N, N′ - Ditritylurea and analogs as hosts in crystalline clathrate complexes: Synthesis and selectivity studies
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Of 38 hosts, most of them new, designed on the 'wheel-and-axle' model, 24 formed clathrate complexes with small molecules; 95 new host/guest combinations are described (Table 6). Selectivity studies (Table 7) show, in some instances, substantial discrimin
- Ng, Kwok-Keung Daniel,Hart, Harold
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p. 7883 - 7906
(2007/10/02)
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