Catalytic conditions for the synthesis of polyureas from diformamides and diamines^a.

Entry	Diformamide	Diamine	Base	Solvent	N2	Yield/%	M n (MALDI)	Al : Ar	T d/°C	T m/°C
1	DF1	DA1	KOtBu	THF	Sealed	82	1877	1.67	246	221
2	DF1	DA1	KOtBu	Anisole	Sealed	77	2111	1.03	246	220
3	DF1	DA1	KOtBu	Anisole	Open	32	2111	1.67	237	201
4	DF1	DA1	KOtBu	Diglyme	Open	79	1904	2.01	238	212
5	DF1	DA1	KOtBu	DMSO	Open	44	—	4.88	266	211
6	DF1	DA1	K2CO3	Anisole	Open	30	1770	1.73	242	204
7	DF2	DA1	KOtBu	Anisole	Open	85	2111	N/A	253	216
8	DF2	DA1	KOtBu	Diglyme	Open	25	2110	N/A	213	210
9	DF2	DA1	KOtBu	THF	Open	78	2594	N/A	247	215
10	DF1	DA2	KOtBu	Anisole	Open	94	3140b	1.16	223	—

^aCatalytic conditions: diamine (0.5 mmol), diformamide (0.5 mmol), solvent (2 mL), complex 1 (2 mol%), and KO^tBu (8 mol%). Al : Ar = aliphatic : aromatic NMR integral relationship. M_n (MALDI, g mol⁻¹): value is estimated as the maximum signal observed in MALDI FT-ICR mass spectrometry. T_d (decomposition temperature) was recorded at 5% mass loss. T_m stands for melting temperature.

^b M _n of 44 000 g mol⁻¹ was estimated using GPC.