Summary of liquid-assisted and neat grinding experiments performed with liquid additives that vary in their chemical nature (protic vs. aprotic), polarity (ε) and quantities used (η)^a.

Liquid additive	Protic vs. aprotic	ε	η/μL mg−1			Type of liquid additive
			0.05	0.15	0.30
Hexane	Aprotic	1.89	■□	○△	△	Catalytic
Ethyl acetate	Aprotic	6.02	■	▲	▲
Acetone	Aprotic	20.7	■	▲	▲
Acetonitrile	Aprotic	37.5	■	▲	▲
Ethanol	Protic	24.5	■	■	■	Inhibitive
Methanol	Protic	32.7	■	■	■
2-Pyrrolidone	Protic	23.6	■	○	○	Prohibitive
Nitromethane	Aprotic	35.9	■	○	○
DMSO	Aprotic	47.2	■	○	○

^aAmorphous salt: ■, physical mixture of reactants: ○, form I: △, form II: ▲.