Not much talk of this.
Patent US4089939 (http://l2.espacenet.com/dips/viewer?PN=US4089939&CY=gb&LG=en&DB=EPD)
2H2 O + SO2 + I2 -> H2 SO4 + 2HI.
Possible?? ;D
look up Tetralin,pinene,electrochemical,um um there are more on the tip of my , ahh fuckit UTFSE.