Preparation and Characterization of Urushiol Methylene Acetal Derivatives with Various Degrees of Unsaturation in Alkyl Side Chain

Table 2

¹H NMR spectral data of compounds 1, 2, 3, and 4 in pyridine-d5 ( in ppm, in H_Z).

Carbon	1	2	3	4
1
2
3
4	6.72(m)	6.77(m)	6.79(m)	6.79(m)
5	6.68(m)	6.69(m)	6.70(m)	6.71(m)
6	7.25(s)	7.27(s)	7.28(s)	7.27(s)
1′	2.56(t, )	2.61(t, = 7.50)	2.59(t, = 7.50)	2.61(t, = 7.50)
2′	1.60(m)	2.61(m)	1.63(m)	1.77(m)
3′	1.58(m)	2.58(m)	1.60(m)	1.74(m)
4′	1.58(m)	2.58(m)	1.53(m)	1.33(m)
5′	1.58(m)	2.55(m)	1.48(m)	1.60(m)
6′	1.58(m)	2.55(m)	1.46(m)	1.65(m)
7′	1.30(m)	2.55(m)	2.56(m)	2.09(m)
8′	1.30(m)	5.38(t, = 3.5)	5.44(t, = 4.5)	5.68(t, = 4.0)
9′	1.25(m)	5.35(t, = 4.0)	5.39(t, = 4.0)	5.65(t, = 4.0)
10′	1.25(m)	2.04(m)	2.81(m)	2.89(m)
11′	1.25(m)	1.65(m)	5.37(t, = 5.0)	5.48(t, = 3.5)
12′	1.25(m)	1.63(m)	5.34(t, = 4.5)	5.46(t, = 4.0)
13′	1.25(m)	1.33(m)	2.06(m)	2.84(m)
14′	1.25(m)	1.31(m)	1.41(m)	5.42(m)
15′	0.87(t, = 6.3)	0.92(t, = 6.3)	0.95(t, = 6.3)	5.39(d, = 5.0)
-O-CH2-O-	5.92(s)	5.94(s)	5.94(s)	5.99(s)