P-толуолсульфанил изоциана

Химические свойства

clear liquid

Использование

p-Toluenesulfonyl isocyanate is a reagent used to prepare acetylated syn-1,2-diols,1 oxazolidin-2-ones,2 2,3-diamino acids,3 and N-tosylcarbonamides.4

Общее описание

p-Toluenesulfonyl isocyanate undergoes palladium-catalyzed bis-allylation reaction with allylstannanes and allyl chlorides.

Профиль реактивности

p‐Toluenesulfonyl Isocyanate (PTSI) is recommended especially for one‐component, low‐VOC polyurethane coatings. The reaction of PTSI with water introduced from pigments and solvents in the paint formulation generates carbon dioxide and soluble inert chemical products. Experience has demonstrated that 13 grams of PTSI effectively scavenges 1 gram of water. PTSI reacts with water in a 1 to 1 molar ratio, generating PTSA and carbon dioxide gas. This reaction occurs readily at room temperature and does not require heating. The PTSA generated in the process is essentially an inert material that does not further react with PTSI or other isocyanate groups, resulting in the formation of insoluble ureas. The hydroxyl group is reacted with excess p-toluenesulfonyl isocyanate (TSI) to form an acidic carbamate. Water is added to convert unreacted isocyanate to sulfonamide, followed by direct potentiometric titration of the acidic carbamate with tetrabutylammonium hydroxide (Bu4NOH) in nonaqueous medium.

Опасность

Moderately toxic by ingestion. Low toxicity by inhalation. A mild skin and moderate eye irritant.