Risalve!
Sono riuscita, con sommo sforzo, a scrivere la reazione di sintesi del PLA con meccanismo, ma non riesco ancora a far sì che i legami non invadano lo spazio dello stagno (Sn)!
Suggerimenti? 😀
`
\usepackage{chemfig}
\schemestart
\chemfig[][scale=0.75]{[:30]O*6(-(-CH_3)-(=O)-O-(-CH_3)-(=O)-)}\qquad
\arrow{<=>[\tiny R-OH][\tiny Sn(Oct)$_2$]}[0]
\chemfig[][scale=0.75]{[:30]O*6(-(-CH_3)-(=O-[1,,,,dash pattern=on 2pt off 2pt](?Sn(-Oct_2)-[2,,,,dash pattern=on 2pt off 2pt]O(-[:180]H)(-[:90]R)))-O-(-CH_3)-(=O)-)}\qquad
\arrow{<=>}[-90]
\chemfig[][scale=0.75]{[:30]O*6(-(-CH_3)-(=O-[1,,,,dash pattern=on 2pt off 2pt](Sn(-Oct_2)-[2,,,,dash pattern=on 2pt off 2pt]O(-[:180]H?[a])(-[:90]R)))-O?[a,1,{dash pattern=on 2pt off 2pt}]-(-CH_3)-(=O)-)}\qquad
\arrow{<=>}[180]
\chemfig[][scale=0.75]{[:30]O*8(-(-CH_3)-(-OR)=O-[,,,,dash pattern=on 2pt off 2pt](Sn(-Oct_2))-[,,,,dash pattern=on 2pt off 2pt]O(-[,,,,dash pattern=on 2pt off 2pt]H)-(-CH_3)-(=O)-)}\qquad \arrow{<=>}[-90]
\chemfig[][scale=0.75]{RO-[:30]([:90]=O)-[:-30](-[:-90]CH_3)-[:30]O-[:-30](=[:-90]O)-[:30](-[:90]CH_3)-[:-30]O(-[:30]H)(-[6,,,,dash pattern=on 2pt off 2pt]Sn(-Oct_2))}
\schemestop
`