Synthesis of Macrocyclic Sulfides Using Cesium Thiolates: 1,4,8,11‐Tetrathiacyclotetradecane

Buter, Jan; Kellogg, Richard M.

doi:10.1002/0471264180.os065.20

Cited by 1 publication

(1 citation statement)

References 28 publications

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“…[10][11][12] In recent, it was synthesized by hydrolysis of KOH or ammonia water in refluxing base conditions via isothiouronium made using HCl and thiourea. [13][14] In this work, thiol materials were prepared by hydrolysis of ammonia via isothiouronium obtained using HCl and thiourea as shown in Scheme 1 and 2. 15 We have tried to obtain thiol compounds using terminal groups such as 3-mercaptopropanol, propanol, ethanol or glycol except the existence of terminal 2-mercaptoethanol units but thiol materials were not produced without terminal 2-mercaptoethanol group.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Novel Polythiol for Plastic Optical Lens and its Ophthalmic Lens

Jang¹,

Roh²,

Kim³

et al. 2009

Bulletin of the Korean Chemical Society

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Novel polythiol materials of urethane lens series for plastic optical lens were synthesized from polyol materials via thioisouronium of thiourea with c-HCl in refluxing aqueous solution, in which polythiol material was carried out from hydrolysis of thioisouronium by ammonia water. Their structure properties were identified by EA, EI-MS, FT-IR, 1 H and 13 C NMR spectroscopies and TGA. Their ophthalmic lenses as polythiourethane material were prepared by thermal curing to an injected glass mold using the evenly solutions of diisocyanates series (TDI, XDI, HDI or IPDI) with polythiols. Polythiourethane shows that the strong stretching mode for SH group of polythiol disappeared in FT-IR spectra after thermosetting polymerization. Thermal deformation starting temperature of ophthalmic lenses was determined by TMA. Ophthalmic lenses made from characteristic polythiol and diisocyanate series have transparency, colorless and good impact strength, in which thermal resistance and impact strength of ophthalmic lenses were influenced by diisocyanate series. Physical properties of ophthalmic lens have contrast thermal resistance with impact strength. The property of thermal resistance and impact strength for respective ophthalmic lenses was examined by TMA and drop ball test.

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