(10H)-phenothiazine; tetra-n-butyl phosphonium chloride T=108 - 112°C; P=75.0075 Torr; 4 h; Product distribution / selectivity;

1: 2-methyl-2-propenoic acid With potassium hydroxide in toluene 2: (chloromethyl)triethoxysilane With 4,4'-bismethylene(2,6-di-tert-butylphenol); tetra-n-butyl phosphonium chloride in toluene; butanone T=110°C; 4 h;

ethanol T=180°C;