Table 1.

Scalar coupling constants (cf. Figure S1) and optimal ¹H→⁷⁷Se transfer delays (cf. Figure S2) for SeDG and different polarisation transfer schemes.

SeDG signal	H1	H2	H3	H4
3 J H,H′ [Hz]	10.0	10.0/9.45	9.45/3.4	3.4/1.0
n J H,Se [Hz]	7.0 (n=2)	7.4 (n=3)	0 (n=4)	3.2 (n=5)
Δ calc [ms][a]	71.4	67.6	–	156
Δ opt [ms][b]	70	>100	85	>100
Δ opt,HeHaHa [ms][c]	70	80	100	140
Δ opt,selHeHaHa [ms][d]	100	–	–	–
Δ calc,selHeHaHa [ms][e]	101	–	–	–

[a] Theoretical transfer delay Δ _calc = 1/(2⋅ⁿ J _H,Se) in the absence of competing couplings and relaxation. [b] Optimal transfer delay for the ¹H,⁷⁷Se CPMG‐HSQMBC experiment; duty cycle limitations precluded sampling for Δ > 100 ms. [c] Optimal transfer delay for the broadband ¹H,⁷⁷Se HeHaHa experiment. [d] Optimal transfer delay for the selective H1,⁷⁷Se HeHaHa experiment. [e] Theoretical transfer delay Δ _{calc,selHeHaHa} = 1/(√2⋅² J _H1,Se) in the absence of HoHaHa.