Tin-Catalyzed Esterification and Transesterification Reactions: A Review

Table 8

Alcoholysis of soybean oil and methanolysis of different Brazilian vegetable oils catalyzed by sulfuric acid or Sn(II)-pyrone complex^a.

Entry	Alcohol	H2SO4 catalyst	Sn(II)-pyrone catalyst
		Ester yield after 1 hour reaction (%)^b
1	Methyl	1.4	37.1
2	Ethyl	1.0	8.3
3	Propyl	—	4.2
Entry	Oil	Ester yield after 1 hour reaction (%)^b
4	Andiroba	3.8	23
5	Babaçu	12.5	35.6
6	Palm tree	8.5	16.2

^aReaction conditions: alcohol : vegetable oil : catalyst molar ratio (400 : 100 : 1), 60°C temperature, and magnetically stirred.