Sodium tetraphenylborate nabph4

(R)-(+)-limonene (LM), hexamethylene diisocyanate (HDI), dibutyltin dilaurate (DBTDL), and sodium tetraphenylborate (NaBPh₄) were obtained from Sigma Aldrich (Saint Louis, MO, USA). Squalene (SQ) and 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU) were obtained from Alfa Aesar (Thermo Fisher, Kandel, Germany). Thioacetic acid (TAA) and 2,2-dimethoxy-2-phenylacetophenone (DMPA) were obtained from Acros Organics (Thermo Fisher Scientific, Geel, Belgium). Anhydrous magnesium sulfate (MgSO₄) was obtained from (Thermo Fisher Scientific, Geel, Belgium). Sodium hydroxide (NaOH), hydrochloric acid (HCl), chloroform (CHCl₃), and methanol (MeOH) were obtained from Scharlab (Barcelona, Spain). All products were used as received. BGDBU, which is a base generator, was synthesized from DBU and sodium tetraphenyl borate according to a reported methodology [24 (link)].

Trimethylolpropane tris(3-mercaptopropionate) (S3), hexamethylene diisocyanate (HDI), dibutyltin dilaurate (DBTDL), 1-methylimidazole (1MI) (pK_a = 7.1, N = 11.9) [25 (link)], triazabicyclodecene (TBD) (pK_a = 14.4, N = 16.16) [25 (link)] and sodium tetraphenylborate (NaBPh₄) from Sigma-Aldrich (Saint Louis, MO, USA), were used as received. 4-(Dimethylamino)pyridine (DMAP) (pK_a = 9.7, N = 14.95) [26 (link)], 1,5-diazabicycle[4.3.0]non-5-ene (DBN) (pK_a = 13.7, N = 15.50) [8 (link)] and 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU) (pK_a = 13.5, N = 15.29) [26 (link)] were supplied by Alpha Aesar (Kandel, Germany). Methanol (MeOH) and chloroform (CHCl₃) were supplied by VWR (Darmstadt, Germany) and were used as received.