# Patent

## Title
Radially activated thermocouple assembly

## Abstract

This is a division of application Ser. No. 185,593, filed Sept. 9, 1980 now U.S. Pat. No. 4,424,399.

## Background
The present invention relates to new unsaturated fatty alcohols and to a novel process for preparing them.

It is an object of the present invention to provide novel unsaturated fatty alcohols.

It is a further object to provide a novel process of preparing the novel unsaturated fatty alcohols of the invention.

Further objects will be apparent to those skilled in the art from the present description.

The compounds of the invention have the general formula (A) shown below: ##STR2## in which n is equal to 2 or 4.

The invention therefore concerns more particularly the novel compounds: hexadeca-1,6,10,15-tetraen-3-ol (n=2) and tetracosa-1,6,10,14,18,23-hexaen-3-ol (n=4).

The invention also has as its object a process of preparing compounds of formula (A) comprising reacting butadiene with water in the presence of a palladium salt and orthoboric acid, B(OH).sub.3, in a polar aprotic solvent.

In accordance with one particular embodiment of the process of the invention, a carboxylic acid is present in the polar aprotic solvent simultaneously with the palladium salt and the orthoboric acid.

It should be emphasized that, within the present invention, the addition of and presence of carboxylic acid is not necessary. However, it makes it possible to increase the stability of the catalytic system formed from the palladium salt. It also makes it possible to increase the selectivity for the alcohol of the formula (A) in which n=2.

The palladium salt is selected preferably from the group comprising palladium carboxylates of the formula (B): (R.sub.1 COO).sub.2 Pd, the allyl complexes of palladium having a carboxylate radical of the formula (C): (R.sub.2 PdR.sub.1 COO).sub.2, and the allyl complexes of palladium having the formula (D); R.sub.2 PdOR.sub.1 in which:

R.sub.1 represents a radical selected from the group comprising alkyl radicals having from about 1 to 6 carbon atoms, such as the methyl, ethyl, isopropyl, and n-butyl radicals and aryl radicals, such as the phenyl, tolyl, benzyl and naphthyl radicals, these radicals being optionally substituted.

R.sub.2 represents a radical of the formula: ##STR3## in which R.sub.3 represents a hydrogen atom or the radical R.sub.1.

As examples of palladium carboxylates of formula (B) which can be used in the process of the invention, mention may be made of palladium acetate and palladium benzoate.

As examples of allyl complexes of palladium of formula (C) which can be used in the process of the invention, mention may be made of the compounds of the following structures: ##STR4##

As example of complex of formula (D) one may mention the compound of the formula: ##STR5##

The solvent is selected preferably from the group of aprotic solvents comprising dimethylformamide, hexamethylphosforus triamide, dimethylacetamide and N-methylpyrrolidone.

The carboxylic acid optionally used in the process of the present invention has the general formula R.sub.4 COOH, in which R.sub.4 represents a radical selected from among the group comprising the alkyl and aryl radicals, optionally substituted.

In accordance with one particular embodiment of the process of the invention, there is employed a carboxylic acid of the formula R.sub.4 COOH, in which R.sub.4 represents an acrylic or cyclic alkyl radical having from about 1 to 12 carbon atoms. Mention may be made in particular of the acids of the following formulae: ##STR6##

In accordance with another specific embodiment of the process there may be employed a carboxylic acid of the formula R.sub.4 COOH in which R.sub.4 represents a radical having a formula selected from the group comprising of: ##STR7## in which R.sub.5 represents a radical selected from the group comprising hydrogen, OH, and the alkyl raicals having from about 1 to 12 carbon atoms.

Mention may be made in particular of the acids of the following structural formulae: ##STR8##

In the process of the invention a temperature between about -5.degree. C. and about +150.degree. C. is generally employed. The temperature is preferably selected from between about 10.degree. C. and 35.degree. C. when operating without the addition of a carboxylic acid. When operating in the presence of the latter, the temperature is preferably between about 50.degree. C. and 100.degree. C.

The use of a carboxylic acid, which increases the stability of the catalyst system, makes it possible to carry out the reaction at a higher temperature. This results in an increase in the reaction velocity and, therefore, an increase in the yield of the desired alcohol.

The molar ratio of butadiene to water employed in the process is preferably between about 0.1 and 10:1. More particularly, it is preferred to use the butadiene and the water in a molar ratio close to about 1:1. The ratio of the number of mols of butadiene to the number of gram-atoms of palladium is generally between about 100 and about 1000 to 1. A value of close to 300:1 is preferred. Values less than or greater than this range are not excluded since they do not affect the selectivity, but only the reaction velocity. In order to obtain the best selectivity, one preferably operates with a molar ratio of water to boric acid, B(OH).sub.3, of between about 0.1 and about 20:1. Even more preferably, there is used a molar ratio of H.sub.2 O to B(OH).sub.3 of between about 2 and about 10:1.

The ratio of the number of mols of carboxylic acid to the number of gram-atoms of palladium is preferably between about 0.5 and about 20:1. Even more preferably it is between about 2 and about 6:1.

It is preferred to carry out the process of the invention in a homogeneous medium. The boric acid will therefore be used in an amount which does not exceed the limit of solubility (250 g/l of solvent approximately at room temperature). The amounts of boric acid are therefore determined by the amounts of solvent. The latter must be sufficient for the butadiene to be soluble in the water-solvent mixture.

The process of the invention is desirably conducted at autogenous pressure, although pressures greater or less than autogenous pressure are not excluded from the invention.

The reaction time, when operating within the above-indicated preferred temperature ranges, is preferably between about 1 and 30 hours. Beyond 30 hours, the formation of heavy compounds increases.

In order to decrease the formation of heavy compounds (oligomers of butadiene, non-functional polymers and polymers having alcohol functions) one may add a phosphine, such as triphenylphosphine, P(.phi.).sub.3, to the reaction system. A phosphine is preferably used in an amount such that the atomic ratio: P3+/Pd--is between about 0.1 and about 0.5:1. This ratio is preferably close to about 0.25:1.

The process of the invention can be carried out continuously or batchwise. The products obtained having the formula (A) can be hydrogenated to form saturated linear alcohols of the following formula: ##STR9## where n=2 or 4 as in formula (A) above. This can be done by hydrogenation at a pressure of 50 bars of hydrogen employing pentane as the solvent at a temperature of about 20.degree. C., employing a catalyst of palladium or platinum deposited on carbon black support in the amount of 10% of palladium or platinum. Alternatively, said products may be isomerized and hydrogenated to form saturated linear alcohols of the formula: ##STR10## where n has the meaning. This can be done by isomerizing the product of formula (A) in dioxane as a solvent at a temperature of about 100.degree. C. over a catalyst of palladium, acetylacetonate and triphenylphosphine and then hydrogenated as above to produce saturated linear alcohols of the above formula.

These saturated linear alcohols are precursors of biodegradable detergents, which can be prepared by reaction of the alcohol with ethylene oxide at a temperature of about 140.degree. C. to provide a non-ionic detergent. Those saturated alcohols having a formula RCH.sub.2 OH can also be converted to ionic detergents by reaction with sulfuric chlorohydride (HCl-SO.sub.3) to produce compounds of the formula RCH.sub.2 --O--SO.sub.3 H which can be neutralized with a base, such as ammonia, to produce an ionic detergent of the formula RCH.sub.2 --O--SO.sub.3 NH.sub.4.

The compounds of formula (A) can also be isomerized to form ketones of the following formula: ##STR11## or isomerized and hydrogenated to form ketones of the following formula: ##STR12## In both of these formulae, n=2 or 4. This can be done by isomerizing the compound of formula (A) at a temperature of about 110.degree. C. over a catalyst of palladium or platinum on a carbon black support or a catalyst of hydridochlorotris (triphenylphosphine) ruthenium. Similarly, the products of formula (A) can be subjected to this same isomerization as just described and then hydrogenated as described above for the production of saturated linear alcohols.

The process of the invention is preferably, but not necessarily, carried out in an oxygen-free atmosphere.

In order to disclose more clearly the nature of the present invention, the following examples illustrating the invention are given. It should be understood, however, that this is done solely by way of example and is intended neither to delineate the scope of the invention nor limit the ambit of the appended claims. In the examples which follow, and throughout the specification, the quantities of material are expressed in terms of parts by weight, unless otherwise specified.

80 mg. of palladium acetate (0.35 mg. atom of Pd) and 1 g. (16 millimols) of boric acid were introduced into a thick-walled glass tube and agitated by a Teflon-coated bar, driven by a magnetic agitator. The tube was purged three times by a vacuum-argon system and thereupon 10 g. of dimethylformamide, the amount of water indicated in Table I, below, and 4.5 g. of butadiene (92 millimols) were added one after the other.

Agitation of the contents was effected for 24 hours at 20.degree. C. Analysis by gaseous-phase chromatography showed that the following four products (I to IV) were obtained: ##STR13## (III) oligomerization products of butadiene; and (IV) polymerization products of butadiene having more than 24 carbon atoms.

These compounds can be separated from each other by any technique well known to the man skilled in the art, such as, for instance, distillation under reduced pressure.

The results obtained are given in Table I, below.

In a number of the examples which follow and in a number of the tables which follow, the products obtained will be referred to by Nos. I, II, III and IV, which will be employed to indicate the products as identified by the same numbers above.

The same procedure of Example 1 was repeated, but varying amounts of boric acid and water as indicated in Table II, below, were employed. The results obtained are indicated in Table II, below.

The procedure of Example 1 was repeated, but increasing the amount of solvent (dimethylformamide) from 10 to 15 g. and using either 1 g. or 2 g. of boric acid with variable amounts of water as indicated in Table III, below. The results obtained are given in said Table III, below.

The procedure of Example 1 was repeated, but with a molar ratio of H.sub.2 O to B(OH).sub.3 of 4 and using the different catalysts indicated in Table IV, below, which table also sets forth the results obtained.

The procedure of Example 1 was repeated, but employing a molar ratio of H.sub.2 O to B(OH).sub.3 of 4 and adding 29.6 mg. of triphenylphosphine of the formula: ##STR14## (0.113 miligram atom of P.sup.3+).

The conversion rate of the butadiene was 27.4%. There were obtained: Compound No.    Amount ______________________________________ I               0.560 g. II              0.095 g. III             0.142 g. IV              0.323 g. ______________________________________

The procedure of Example 23 was repeated, but adding, instead of triphenylphosphine, 57.8 g. of metasulfonated triphenylphosphine of the formula: ##STR15## (0.094 milligram atom of P.sup.3+).

The conversion rate of the butadiene was 34.2%

There was obtained: Compound No.    Amount ______________________________________ I               0.629 g. II              0.149 g. III             0.161 g. IV              0.400 g. ______________________________________

The procedure of Example 1 was repeated, but with a ratio of H.sub.2 O to B(OH).sub.3 of 4, but varying the nature of the solvent (in each case 10 g. of solvent was used). The solvents employed and results obtained are set forth in Table V, below.

The procedure of Example 1 was repeated, but with a molar ratio of H.sub.2 O to B(OH).sub.3 of 4, and also varying the amount of palladium acetate. The results are set forth in Table VI, below.

The procedure of Example 1 was repeated, but with a molar ratio of H.sub.2 O to B(OH).sub.3 of 4, and also varying the temperatures. The results are set forth in Table VII, below.

The procedure of Example 1 was repeated, but with a molar ratio of H.sub.2 O to B(OH).sub.3 of 4, and also varying the butadiene concentrations. The results are set forth in Table VIII, below.

The procedure of Example 1 was repeated, but using a molar ratio of H.sub.2 O to B(OH).sub.3 of 2 (Table IX, below, for Examples 41 to 45) or else 4 (Table X, below, for Examples 46 to 50) and varying the reaction times. The results are shown in Tables IX and X, below.

1.20 g. (5.34 milligram atoms of Pd) of palladium acetate and 15 g. (242 millimols) of orthoboric acid were introduced into an 0.5 liter stainless steel autoclave. It was purged three times by a vacuum-argon system and 164 g. of dimethylformamide, 17.64 g. of water (0.98 mol) and 62 g. of butadiene (1.15 mol) were then added one after the other. Agitation was effected at 20.degree. C. for 24 hours. The conversion rate of the butadiene was 41%. After addition of water and neutralization of the boric acid by sodium bicarbonate, 27 g. of organic phase were obtained, analysis of which by gasous-phase chromatography shows that it contains: Compound No.          Amount ______________________________________ I                     10.08  g. II                    3      g. III                   1.31   g. IV                    11.29  g. ______________________________________

80 mg. of palladium acetate (0.35 milligram atom of Pd), 1 g. (16 millimols) of orthoboric acid and an amount of carboxylic acid, such that the atomic ratio H+/Pd was equal to 2, were added to a thick-walled glass tube which was stirred by a Telfon-coated bar driven by a magnetic agitator. The tube was purged three times by a vacuum-argon system and thereupon there were introduced, in succession, 10 g. of dimethylformaide, 1.2 g. of water (molar ratio H.sub.2 O/B(OH).sub.3 =4) and 4.5 g. of butadiene (92 millimols).

Agitation was effected for 24 hours at 25.degree. C.

The results obtained are indicated in Tables XI and XIA, below.

The procedure of Example 1 was repeated, but employing:

Heating was effecterd at 50.degree. C. for 2 hours.

The conversion rate of the butadiene was 37.7%.

There were obtained: Compound No.    Amount ______________________________________ I               0.807 g. II              0.267 g. III             0.139 g. IV              0.501 g. ______________________________________

The procedure of Example 59 was repeated, but with heating at 50.degree. C. for 16 hours.

The conversion rate of the butadiene was 63.5%. There were obtained: Compound No.    Amount ______________________________________ I               1.140 g. II              0.333 g. III             0.239 g. IV              0.866 g. ______________________________________

The procedure of Example 60 was repeated, but using 1.79 g. of H.sub.2 O.

The conversion rate of the butadiene was 54.8%. There were obtained: Compound No.    Amount ______________________________________ I               1.325 g. II              0.296 g. III             0.240 g. IV              0.305 g. ______________________________________

The procedure of Example 1 was repeated, but employing:

Heating was effected at 50.degree. C. for 2 hours.

The conversion rate of the butadiene was 34%.

There were obtained: Compound No.    Amount ______________________________________ I               0.815 g. II              0.206 g. III             0.186 g. IV              0.335 g. ______________________________________

The procedure of Example 62 was repeated, but using 1.78 g. of H.sub.2 O.

The conversion rate of the butadiene was 21.3%.

There were obtained: Compound No.    Amount ______________________________________ I               0.506 g. II              0.111 g. III             0.162 g. IV              0.149 g. ______________________________________

Into a 125 ml. stainless steel autoclave there were introduced:

Heating was effected with agitation at 65.degree. C. for 1 hour.

The conversion rate of the butadiene was 30.4%.

There were obtained: Compound No.    Amount ______________________________________ I               2.292 g. II              0.693 g. III             0.714 g. IV              0.918 g. ______________________________________

The procedure of Example 1 was repeated, but using:

Heating was effected at 50.degree. C. for 4 hours.

The conversion rate of the butadiene was 25.8%

There were obtained: Compound No.    Amount ______________________________________ I               0.702 g. II              0.118 g. III             0.159 g. IV              0.156 g. ______________________________________

The procedure of Example 65 was repeated, but heating at 50.degree. C. for 16 hours.

The conversion rate of the butadiene was 55.6%. There were obtained: Compound No.    Amount ______________________________________ I               1.333 g. II              0.167 g. III             0.286 g. IV              0.393 g. ______________________________________

The procedure of Example 66 was repeated, but using 1.8 g. of H.sub.2 O.

The conversion rate of the butadiene was 35%.

There were obtained: Compound No.          Amount ______________________________________ I                     0.921  g. II                    0.08   g. III                   0.161  g. IV                    0.0    g. ______________________________________

The procedure of Example 67 was repeated, but heating at 65.degree. C. for 2 hours.

The conversion rate of the butadiene was 29.1%.

There were obtained: Compound No.    Amount ______________________________________ I               0.757 g. II              0.110 g. III             0.193 g. IV              0.035 g. ______________________________________

The procedure of Example 64 was repeated, but using:

Heating was effected at 80.degree. C. for 1 hour.

The conversion rate of the butadiene was 31.4%.

There were obtained: Compound No.          Amount ______________________________________ I                     1.59   g. II                    0.254  g. III                   0.572  g. IV                    0.230  g. ______________________________________

The procedure of Example 69 was repeated, but using 0.110 g. of palladium acetate (0.49 milligram atom of Pd) and 0.243 g. of benzoic acid (2 millimols).

The conversion rate of the butadiene was 27.1%.

There were obtained: Compound No.    Amount ______________________________________ I               1.196 g. II              0.190 g. III             0.335 g. IV              0.097 g. ______________________________________

The procedure of Example 64 was repeated, but using:

Heating was effected with agitation at 95.degree. C. for 30 minutes.

The conversion rate of the butadiene was 44.1%.

There were obtained: Compound No.    Amount ______________________________________ I               1.807 g. II              0.413 g. III             1.179 g. IV              0.413 g. ______________________________________

The procedure of Example 71 was repeated, but using 0.152 g. of palladium acetate (0.68 milligram atom of Pd), 0.334 g. of benzoic acid (2.73 millimols) and 14 g. of butadiene.

Heating was effected at 80.degree. C. for 1 hour.

The conversion rate of the butadiene was 29.1%.

There were obtained: Compound No.          Amount ______________________________________ I                     2.06   g. II                    0.242  g. III                   0.643  g. IV                    0.428  g. ______________________________________ __________________________________________________________________________ Amount           Conversion of water  Molar ratio rate of Products obtained (g) Examples (g)  H.sub.2 O/B(OH).sub.3 butadiene (%) I   II  III IV __________________________________________________________________________ 1    0    0      3.5     0   0   0.1 0 2    0.14 0.48   11.5    0.230 0.058 0.079 0.112 3    0.29 1      30.3    0.481 0.2 0.095 0.605 4    0.62 2.1    34.9    0.413 0.22 0.113 0.875 5    1.09 3.65   34      0.572 0.22 0.084 0.668 6    1.2  4.2    31.9    0.514 0.157 0.081 0.64 7    1.85 6.5    28.7    0.573 0.133 0.130 0.49 8    2.8  9.45   21      0.397 0.13 0.119 0.24 __________________________________________________________________________ __________________________________________________________________________ Amount      Conversion Amount of  of water Molar ratio rate of Products obtained (g) Examples B(OH).sub.3 (g) (g)  H.sub.2 O/B(OH).sub.3 butadiene (%) I   II  III IV __________________________________________________________________________ 9   0     0    0      0       0   0   0  0 10   0.5   0.3  2.04   32      0.192 0.150 0.10 1 11   1.01  0.55 1.86   46.7    0.832 0.268 0.10 1.05 12   2.01  1.34 2.28   23      0.695 0.160 0.02 0.30 13   2.09  2.36 3.9    15.4    0.36 0.091 0.12 0.246 14   1.96  3.43 6      15.9    0.358 0.018 0.08 0.17 __________________________________________________________________________ __________________________________________________________________________ Amount of  Amount of    Conversion B(OH).sub.3 H.sub.2 O Molar ratio rate of Products obtained (g) Examples (g)   (g)   H.sub.2 O/B(OH).sub.3 butadiene (%) I  II III IV __________________________________________________________________________ 15   1     1.1   3.7    25      0.197 0.06 0.026 0.757 16   1     1.67  5.5    35.7    0.612 0.164 0.056 0.680 17   2     2.49  4.2    21.8    0.533 0.136 0.029 0.330 18   2     3.73  6.7    22.7    0.663 0.090 0.088 0.266 __________________________________________________________________________ __________________________________________________________________________ Catalyst           Number of Conversion Amount milli-gram rate of Products obtained (g) Example Nature   (g)  atoms of Pd butadiene % I  II III IV __________________________________________________________________________ 19   Pd(CH.sub.3COO).sub.2 0.08 0.35  47.0   0.897 0.271 0.090 0.944 20   .sup.1   0.107 0.4   55     0.392 0.264 0.037 1.48 21   .sup.2   0.063 0.306 27.8   0.486 0.130 0.024 1.10 22   (.phi.COO).sub.2 Pd 0.121 0.325 37.2   0.943 0.221 0.094 0.419 __________________________________________________________________________ ##STR16##   .sup.2 (CH.sub.3COO Pd C.sub.3 H.sub.5).sub.2 bis(.pi.-allyl palladium acetate) ______________________________________ Conversion Nature of    rate of     Products obtained (g) Example solvent   butadiene % I    II   III  IV ______________________________________ 25     Dimethyl- 47          0.897 0.271 0.090 0.944 formamide 26     N--methyl- 27.4        0.522 0.101 0.104 0.408 pyrrolidone 27     propyl    5           0.028 0.045 0.010 0.355 carbonate ______________________________________ __________________________________________________________________________ Number of Conversion Concentration Amount of Pd milligram- rate of Products obtained (g) Example of Pd (ppm) acetate (mg) atoms of Pd butadiene (%) I  II III IV __________________________________________________________________________ 28    760    26.5    0.118 10.7    0.230 0.045 0.018 0.175 29   1320    46.5    0.207 23.4    0.456 0.116 0.046 0.39 30   2250    79.5    0.35  47      0.897 0.271 0.090 0.944 31   3000    105.6   0.470 58.3    1.034 0.343 0.139 1.164 32   4000    140.8   0.627 68.3    1.198 0.414 0.192 1.315 33   4500    158     0.705 74.4    1.159 0.468 0.212 1.414 34   5070    180     0.800 77.2    1.216 0.468 0.253 1.653 __________________________________________________________________________ ______________________________________ Temper-      Conversion ature        rate of     Products obtained (g) Example (.degree.C.) butadiene (%) I    II   III  IV ______________________________________ 35     10        11          0.139 0.036 0.020 0.315 36     35        63.2        1.089 0.354 0.231 1.263 37     50        66.6        0.771 0.419 0.323 1.491 ______________________________________ ______________________________________ Amount of butadiene      Conversion Products obtained (g) Example (g)        rate (%)  I    II   III  IV ______________________________________ 38      2.48       36.8      0.592 0.151 0.080 0.450 39      4.5        31.9      0.514 0.157 0.081 0.638 40      9.65       12.6      0.500 0.150 0.077 0.520 ______________________________________ ______________________________________ Reaction    Conversion time        rate of     Products obtained (g) Examples (hours)  butadiene (%) I    II   III  IV ______________________________________ 41      5       13.2        0.235 0.090 0.043 0.38 42      7       25.9        0.351 0.154 0.055 0.48 43     17       39          0.972 0.220 0.083 0.56 44     41       51          0.665 0.254 0.110 0.823 45     95       54.7        0.405 0.364 0.130 1.56 ______________________________________ ______________________________________ Reaction    Conversion time        rate of     Products obtained (g) Examples (hours)  butadiene (%) I     II   III  IV ______________________________________ 46      7       12.6        0.23  0.075 0.030 0.260 47     16       26.5        0.47  0.140 0.050 0.520 48     24       31.9        0.51  0.157 0.081 0.638 49     40       43           0.833 0.310 0.170 0.960 50     96       48.7         0.861 0.340 0.200 1.050 ______________________________________ ______________________________________ Conver- sion Ex-  Acid added     rate of am-             weight   butadiene Products obtained (g) ples type       (mg)     (%)   I    II   III  IV ______________________________________ 52 ##STR17##   87.2  27.4   0.679 0.124 0.074 0.31 53 ##STR18## 98      30     0.684 0.150 0.103 0.228 54 ##STR19## 95      25.2   0.636 0.098 0.052 0.333 55 ##STR20## 94      31.1   0.770 0.159 0.074 0.453 ______________________________________ ______________________________________ Conver- sion Ex-  Acid added     rate of am-             weight   butadiene Products obtained (g) ples type       (mg)     (%)   I    II   III  IV ______________________________________ 56              130     11     0.266 0.029 0.075 0.069 ##STR21## 57 ##STR22## 93      32.3   0.705 0.200 0.151 0.491 58 ##STR23## 82      29.5   0.535 0.103 0.081 0.595 ______________________________________

The terms and expressions which have been employed are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the invention claimed.

## Claims

1. A process of preparing an unsaturated fatty alcohol of the formula: ##STR24## in which n=2 or 4, comprising reacting butadiene with water in the presence of a palladium salt and boric acid, B(OH).sub.3, in a polar aprotic solvent.

2. A process according to claim 1, wherein there is also present a carboxylic acid.

3. A process according to claim 1, wherein the palladium salt is selected from among the group consisting of palladium carboxylates of the formula: (R.sub.1 COO).sub.2 Pd, allyl complexes of palladium having a carboxylate radical of the formula: (R.sub.2 PdR.sub.1 COO).sub.2, and allyl complexes of palladium of the formula R.sub.2 PdOR.sub.1, in which: radicals having from about 1 to 6 carbon atoms and aryl radicals; ##STR25## in which R.sub.3 represents a member selected from hydrogen and the radical R.sub.1.

4. A process according to claim 3, wherein said R.sub.1 is substituted.

5. A process according to claim 3, wherein the palladium salt is a member selected from palladium acetate and palladium benzoate.

6. A process according to claim 3, wherein the palladium salt is selected from the group consisting of salts of the following formulae: ##STR26##

7. A process according to claim 1, wherein the solvent is selected from the group consisting of dimethylformamide, hexamethylphosforotriamide, dimethylacetamide and N-methylpyrrolidone.

8. A process according to claim 2, wherein the carboxylic acid has the general formula: R.sub.4 COOH, in which R.sub.4 represents a radical selected from among the group consisting of alkyl and aryl radicals.

9. A process according to claim 8, wherein the group R.sub.4 is selected from among the class consisting of acyclic and cyclic alkyl radicals having from about 1 to 12 carbon atoms.

10. A process according to claim 9, wherein the group R.sub.4 represents groups having a structure represented from among the following formulae: ##STR27##

11. A process according to claim 7, wherein the group R.sub.4 represents a radical selected from the formulae consisting of ##STR28## in which R.sub.5 represents at least one radical selected from among the group consisting of hydrogen, OH, and alkyl radicals having from about 1 to 12 carbon atoms.

12. A process according to claim 11, wherein the group R.sub.5 represents hydrogen.

13. A process according to claim 1, wherein a temperature of between about -5.degree. C. and +150.degree. C. is employed.

14. A process according to claim 1, wherein the molar ratio of butadiene to water is between about 0.1 and 10 to 1.

15. A process according to claim 14, wherein the molar ratio is about 1 to 1.

16. A process according to claim 1, wherein the ratio of the number of mols of butadiene to the number of gram-atoms of palladium is between about 100 and about 1000 to 1.

17. A process according to claim 16, wherein the ratio is about 300 to 1.

18. A process according to claim 1, wherein the molar ratio of the water to the boric acid is between about 0.1 and about 20 to 1.

19. A process according to claim 18, wherein the ratio is between about 2 and about 10 to 1.

20. A process according to claim 2, wherein the ratio of the number of mols of carboxylic acid to the number of gram-atoms of palladium is between about 0.5 and about 20 to 1.

21. A process according to claim 20, wherein the ratio is between about 2 and about 6 to 1.

22. A process according to claim 1 wherein a phosphine is introduced into the reaction medium.

23. A process according to claim 21, wherein the phosphine is present in an amount such that the atomic ratio P.sup.3+ /Pd is between about 0.1 and about 0.5 to 1.