Chemistry of Essential Oils

344 THE CHEMISTEY OF ESSENTIAL OILS

PHELLANDKBNB OILS IN WHICH THE SESQUITEBPENE IS A PRO-

NOUNCED CONSTITUENT.

| No.

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

J.acmenoides

angophoroides.

capitellata

crebra

Dawsoni.

fastigata.

Fletcheril

gomphocephala.

cBmastoma

m€tcrorrhyncha

melanophloia.

microtheca

nigra

ovalifolia.

Planchoniana.

pilularis.

robusta

siderophloia

sideroxylon v.pallens

stellulata.

viminalis.

virgata

Refractive

Index

ndl6° C.

1-5056

1-4881

1.4828

1-4844

1-5144

1-4873

1-4881

1-4815

1-5013

1-4802

1-4950

1-4895

1-4871

1-4921

1-4878

1-4961

1-4801

1-5000

1-4884

1-4902

1-4855

1-5015

Specific

Gravity

H°C.

•9266

•9207

•9176

•8989

•9528

-8948

•8882

•8752

-9196

•9166

•8959

-8866

-8838

•8911

•9166

•8924

•8899

•9081

•9167

•8766

•9088

•9352

Specific

Refractive

Energy

nd— I

d.

•5466

•5301

•5261

•5388

•5399

•5446

•5495

•5501

•5451

•5239

•5526

'•5521

•5511

•5522

•5322

-5559

-5395

•5506

•5328

•5589

•5342

•5363

No. 102 is the only

oil more soluble

than with 1 vol-

ume 80 per cent,

alcohol; a large

number were in-

soluble in 10 vol-

umes 80 per cent,

alcohol.

OILS NOT CLASSIFIED; CONTAINING GERANIOL AND ITS ACETIC ACID

ESTER, CITRAL, CITRONELLAL, ETC.

115

116

117

118

E. citriodora.

Do. Mr. Ingham, Qld.

E. Macarthuri

Do. cont. 64-73% ester

Do. cont. 68

• 8 % ester
  E. Staigeriana

„ aggregata.

1-4651

1-4678

1-4793

1-4763

1'4768

1-4871

1-5062

•8887

•8829

•9271

•9252

•9287

•8708

•9701

•5233

•5298

•5172

•5148

•5134

•5594

•5128

Soluble in 1'5 vote.

70°/ 0 alco. atl6°C.

Soluble in 1-3 vol-

umes 70% alcohol.

Insoluble in 6 vol-

umes 80°/0 alcohol.

Insoluble in 10 vols.

80% alcohol.

H. G. Smith^2 has also isolated a sesquiterpene, which is present in

many eucalyptus oils in the portions boiling at above 255°, and which,

in the oil of Eucalyptus hamastoma, represents as much as 50 per cent,

of that fraction. It does not yield crystallised derivatives, but, on the

other hand, when dissolved in glacial acetic acid, it gives characteristic

colour-reactions with acids and also with bromine. When submitted

to the action of bromine vapour the oil acquires first a crimson-red

colour, then violet, and finally indigo-blue. The sesquiterpene, prepared

as pure as possible by fractional distillation, boils at atmospheric pres-

sure at 260° to 265°, and has at 19° the specific gravity O9249. Smith

proposes for the sesquiterpene the name " aromadendrene ".

This sesquiterpene, according to Schorger,^3 may also be present in

the turpentine oil from Pinus Lambertiana.

(^1) Denotes the presence of a small amount of aromadendral in the oil.
(^2) Jour, ofProc. Roy. Soc.,N.S.W.
3 t^35 (1901), 124.
U.S. Dept. Agric. Forest Service, Bull. 119.